Pneumatic hammer.



v PATENTED MAR. 13, 1906. R. A. NURLING. PNEUMATIG HAMMER. APPLICATION FILED mm1, 1905.

lili m, .51.1.1.1 f n t( w Nm..

No. 814,983. PATBNTBD MAR. 13, 1906.

R. A. NORLING. PNEUMATIG HAMMER.

n APYLIOATIoN FILED MAY a1, 1905. e SHEETS-SHEET 2.

.BNN N k 'gli .1.x 1m a gifs? No. 814,983. PATBNTE) MAR. 13, 1906` R. A. NORLING. PNEUMATIG HAMMER.

APPLICATION FILED MAYSI, 1905.

PATENTED MAR.13,1906; l R. A. NORLING. PNEUMATIG HAMMER. APPLICATION FILED MAYSI, 1905.

6 SHEETS-SHEET 4.

No. 814,983. y I PATENTE MAR. 13, 1906.

R. A. NORIJNG. c PNBUMATIG HAMMER. APPLTON FILEDl MYBJ., 1905.

6 SHEETS-SHEET 5.

No, 814,983. PATENTED MAR. 13, 1906.

,11. A. NoRLNG. PNBUMATIG HAMMER.

APPLICATION FILED MAYSI, 1905.

@55615 K wel LLJ @y tion of the saine, taken trai nurrnn REINHQLD A. Nomine. or Annone., iLLniois, i\..,sieN in rro AUnonA auroMArie uiernnaur Coin-Arr or uniform. ninni'ois, A oon- PORATIN OF iLLiNGl.I

Specification of Letters Patent.

C emana-i zttented. arch 13, 1906.

To all whom if 71mg/ mmecrm Beit known that i, Rnrnnor'n A. Non Litre., a citizen of the United States, residn at iurora, in the 'county of Kane and State oi lili nois, have invented certain new and useful Im roveinents 'in Pneumatic i-iannners; und I o hereby declare that the following is a full, cleary and exact description thereof, relerenee beinf-i had to the accompanying drawings, and to the letters of reference marked thereon, which forni a part of this speeifioe tion.

This invention relates to a. pneuniatie tool in the nature of a portable pneumatic hinnmer or device of that Class embracing a harrelor cylinder, 'a piston or plunger adapted to 'slide therein, and a oontiliing-valve through which the air or other iuid'under pressure is admitted to and permitted to es cape from the opposite ends oi the cylinder or barrel to give reoiproeatory movement to the flunger therein.

T e tool illustrated in the ner-.onumnjv'ing drawings is designed lfor use as u. rivetinghammer; but the saine 'features of eo uotion illustrated 'in said drawings und herein claimed may be employed in e too?. used ier chipping or other purposes.

The invention consists in the matters heroinaiter described and more i'ifirtif-.uhirly pointed out in `the appended oiainis.

y As shown in the accompanying: drawings, Figure i is a View in central longitudinal ser tion of a tool embodying my inveiniii'in, taken throughthe central. axis ol the. throitle valve. Fig. 2 is a. central lfmgVudunii see- 'ely' 't hrou gh the throttlewalve and through *he ntral axis of the controlling-valve. ig. l is an enlarged detail section taken upon iine 5S 3 oi" Fig. 2 and'showing the throttle-vein and ad'aeent parts. Fig. i is a like enlnrg'ed detai section taken online 4 i of Fig. 1. Fig. 5 is an enlarged detail longitudinal section through the Controlliiig-valve, teken on line 5 5 of Fig. i2. Fig. 6 is a. section like Fig. 5, showing the valve-piston in n. changed posi tion. p through the controlling' faire und lmrrel upon line 7'7 oi Fig. 4. n, E), :ind i() nre views in side elevation oi the controllingvalve bushing. Fig. l is a longitudinal see.-

Fig, 7 is a detail eross-seetion taken i tion of said hushinpg;taken on line 11 11 of Fig. O. Figs. l2, 1:3, 1%.'15. and 16 are seciionnl views of said conti-oliing-valve hushing, taken upon lines 1.2 l2. 13 13, 114 i4, 15 15, audio lo of Figs. 8, i(),and 11. Figlis a detail longitudinal section taken upon the indireet line 17 l? of Fig. 1E). Fig. 18 is a like detail section taken upon the indirect line i8 i8 oi Fig. 1). Fig. 'i9 is a detail erosssection taken on lino 19 19 of Fig. LL.' Fig. 2O is n. detail cross-section taken upon theline 2li 20 oi'A Fig. i. Fi 2i is a detail ross-sooH tion taken upon li o 2i 2l oi Fig'. i. Fig. 22 ieinii en uetion taken upon line 22 22 oi Fig. a3., Fig. f3 is :i View in central longitudinal section oi' the inner end oi" the cylin-` der, taken through the. central axis of the `oontrolling-valve und lthe auxiliary valve, illustrating; a Construction in which the air- 'supply for operating' the controlling-valve is Carried directly thereto from the throttleval've i "ihi'iut passingi throughthe' cylinder.

is e. cross-section taken upon line. 24 of i*- 23. yFig'. 25 is a section taken longitudinally through the controlling-valve and iransverseiy through the auxiliary Valve on the saine from end to und, and said bore is eiosed at the inner end of the cylinder by means of a screw-plug D. In the inner end of the barrel adjacent to the handle and arranged generally parallel therewith is a tre.usr(freely-arranged throttle-valve Which passes through the plug l) and the parts of the barrel adjacent thereto. On one side of the cylinder at its inner und is located an exltension or projection fournira a valve-easing A" ola Controllingwalve. Said controllingr'nlve einhrnoes :i vulve-bushing E anda valve piston F. Said bushing and piston are cylinidrie and arranged with their central axes nellyY provided with n bore extending through IOO . the tool.

screvethreaded expansihle split .thilnhle GC For expanding the split thimhle the latter is provided with oppositelyinclined interior conical surfaces g'g, and a tube IG is located inthe thimble, said tube having at its `inner endan exterior conical surface adapted to it theinterior conical surface g" of the Vthimrfle G and on its outer end a nut @3, havin at its inner end a conical exterior surface .a apted to lit the conical surface g of the said thimhle.

H is a tool-carrying spindle which is mounted in the outer end et the barrel and against the inner end of Which the longer B is adapt ed to act. 4'Said' tool-spinclde H has a limited sliding movement in a hushin l secured in the enten end of the barrel. The spindle is shown as provided at its outer end with a riveting-head H2, which in the instance illustrated constitutes the tool referred to. For limiting the endwise movement of the spindle H in the barrel the latter is lshown as havin(T attached to it a stop-plate I of segmental form provided With a flange i, that lprojects in to a space or groove formed between two shoulders h it on the head Hi'. The segmental stop-plate I is shown as secured to the end of they barrel by means of Van annular groove a. in the barrel, which is engaged by a ring I', towhioh the stop-plate l is rigidly secured.

The throttle-valve illustrated in the drawings is located in avtransverse bore or passage 'which opens at its ends through the outer surfaces of the opposite side Walls oi the cyl inder. In one end of the bore or passa e is inserted a screw-threaded sleeve or nipp e J, adapted for the attachment thereto of the pipe or hose through which air is supplied to Within said bore or passage is located a tubular valve-bushing K, in which is arranged longitudinally'a valve-stem L, rovided With a valve-disk Z, adapted to ear afrainstI a valve-seat formed on the inner end o the bushing K. The opposite end of said valvefstem extends through a guide-aperture `formed in the outer end of the valve-bushing. The outer end of said valve-stem is H adapted for Contact with an arm m on an actuating lever or trigger M, pivotally mounted on the handle, and its inner end passes through a guide-ring j on the thimble J. Be# tween Ysaid ring y and the valvedislr Z is located ya coiled actuating-spring L, by which the valve-dlsk is held normally against its seat. The bushing L 1s provided between its nd at its inner end or that.

ends with outle'oports .-c it, which communim cate With oblique 9 leading to the controlling-valve chamber. 'he valve-- disk if when sentant with its seat shuts oila comnn'n it 'i between the air-supply geassage interior of the valve-hushing. The valve may oe opened endtvise preissure of the triggers-nn rr against the said valve-spindle L operating against the tension t the spring L and air-pressure acting on the valse-disk..

@low rete ing te the .details of construction illustrated in. tee controlling-valve, the means lor actuating'the saine, and the ports or nassages connecting said va`= y'e with the interior oic the cylinder, Fe p are made as follows: First, referring to the construction of the valve-bushing E, saidl 1oushing is interiorlj,T cylini ric and et smaller interior diameter its t .the plal i est the handle. Lver-piston F is provided with annular eri gements or langes i5" il of equal di jinetei, separated ny grooves or recesses and adapted iit and slide Within the larger cylindric part of the valvahush At its outer end the said valve-piston is provided with a cylindric part F3 of less diameter than the main part of the piston and which'slides ,Within the smaller portion of the valve-hushingformed a port o, which communicates Wit i a recess G, Fins. 5 and 6,formed in the outer surface of trie valve bushing, as clearly seen in Figs. 6, 8, and 14. Said recess O is in communication with the two supply-passages i) 0, which extend from the ports le 7c of the throttle-valve bushing K obliquely through the wall of the cylindcr'to the said recesse The ort o constitutes an inlet-port through ,awh'ic air is supplied to the interior ofthe valve-bushing. The said port ois so arranged that when the valve-piston is at either limit of its movement it will hehetween the enlargements F F2 of said piston, which are at 'such distance apart that the piston may move its full stroke Without the said port o being covered by either of said flanges. Said valve-bushing is also provided With a supply port p, Figs. L l, 9, and 1l, communicating with a cylinder admission-passage P, which opens into 'the inner end of the cylinder. Said 'port p is arranged to come opposite the annular groove between the flanges F/ Fin/hen. the piston is at the inward limit of its move-V ment, but to he covered by the enlargement F when the piston is at the outward limit of its movement, as seen in Figs. 4 and 6. Said enlargements F and F2, with the ports o and p, Fig. 7, serve to control the supply of air to the inner end of the cylinder. When the pis ton is at the inward limit of its movement, the port o is connected with the portip by the groove between the e larged parts F and F2, thereby adinittincr the pressure iluid tothe ln the said valve-hushin isy and the exhaust passes from the/outer end of the cylinder tothel controlling-valve. The

in Figs. et and 5, communication between said .movement, pressur'e fluid passes l'rom the y.supplyfpassages O (l, tliroughthe ports o, the l,port g, passages Q2, and the passages Q to f nicating with an annular groove or recess All, which surrounds the smaller end of the valve- Uitudinal passage 'R2 with the exhaust-port R for the outer end of thc cylinder.

' Q,Z Q2 Q2, which, as shown in Figs. 4 and 22,

inner 'end of the cylinder -for forcing the plunger therein outward. The said bushing E is also provided with a port g,y Figs. 5 and 6, constituting an admission and exhaust port Said port communicates with a recess Q", formed in t ie outer surface of the bushing, as seen in Figs. 5,6, 10, 13, and 22.' The said recess Q is in communication with transverse passages communicate with longitudinal'passages Q Q Q, which extend through the wall of the cylinder and, as seen in Fig. 2, communicate with the interior of the same at its outer end. The port g, recess Q', passages QZ, and passages Q, lugs. 2-and 5, afford corimnimcation between the controlling-valve chamber and .the outer end of the cylinder, by means of which the'pressure fluid is admitted to the said outer end ol the cylinder for lthe purpose of driving the piston or plunger inwardly,

ports o and q are both adapted tuo'coact with the enlargement F2 ol the valvepiston, the arrangement thereof being such t iat the en largement passes over the port g in the mevement'of the valve-piston, so that when the piston is at the outward limit of its movement, as seen in Fig. 6, the ports o and q are connected by the groove between the enlargements F and Fl, and when the piston is at the inward limit of its movement, as seen ports o and g is cut oil by the [lan gc l. When the valve-piston is atthe outward limit oi' its .the outer endet' thecylinder. The bushingF. .1s also provided with a plurality ol' ports 1l ll' n fF1gs.4,5, S, '9, il), ll, l5, and 2l, connnu/ chamber and which communicates by a lonor the inner end of the. cylinder, said port being located at some distance from the admis sion-port. The ports r r r are so located that the flange F3 of the valve-pislon passes over the same in the n'iovement of said piston and will be nearly covered by said llange F ol the valve-piston when vthe latter is at .the inward limit of its movement, as seen in Figs. Ll and 5, but will communicate with the groovej" between the enlargements F2 and F3 when thepiston is at the outward limit ol its move. ment, as seen in Fig. Said valve-imshing E is provided with a main exhaust-port s, arranged between the ports g and r and eommunicating with an exhaust-opening S in the'valverasing. vWhen the. valve-piston is at the inward limit of its 'rnm'ement, as seen in Figsfl and 5, the port q will he in eommunicatmn with the exhaust-port s, Fig. 5, so l .that the exhaust from the outer end of the cylinder will pass through 'the roove between the flanges F? and 1*@ to sai main exhaust-port s. When thel valve-piston is shifted tothe outward limit of its movement, or to the position seen in Fig. 6, the ports r r r will be brought into communication with the exhaust-port s by the groove between the enlargements .F2 and F 3, Fig. 6, and the exhaust from the inner end of theeylinder will pass Jfrom the cylinder-exhaust port R through the exhaust-porter r r to the main exhaust-port s.

From the above it will be understood that when the valve-piston F is at `the outward limit of its movement pressure fluid will be admitted by the supply-passages O O to the passages Q Q, leading to the outer end of the c Ylinder, and when said valve-bushing is at t ie inward limit of its movement the exhaust from the inner end of the c linder will p a ss from the exhaust-port R to t 1e exhaustport S and that the fessure fluid is admitted to the inner end o the cylinder when the valve-piston is at `the inward limit of its movement by the connection of the passages O O with the supply-port P through the port o and port p, and communication is at the same time established between the passa es Q Q, leading to the outer end of the cylin er and the main exhaust -port S, through the port g, as hereinbefore set forth.

Now referring to means shown for shifting or giving endwise movement to the yalvepiston. this is accomplished generally by air- 'n'essure from the sup )ly-pipe acting on the larger part F of the va ve-piston to move the same outwardly and by pressure on the smaller part lils of said piston of air admitted to the inner end o the cylinder from the supply-pipe through the action of an auxiliary valve and by which the valve )iston is 'thrown inwardly, said auxiliary valve being operated by the pressure of air which. is com- )ressed in the inner end ogf the cylinder in the ach stroke ol' the plunger. For ,givinU outward movement. to the valve-piston a lon Titudinal 'passage T, F ig. 17, vis formed in tie wall of the cylinder and communicates at the inner end thereof by an oblique passage "l" with the space. between the inner'enlargement F ol' the valve-piston and the plate G, which forms the end wall of the valve-cham ber. Ba id passage T communicates with the ITS interior olA the bushing- E by means of a'small i ISO its opposite end is connected with the smaller end of the valve-chamber or the space hetween the part F3 ol the valve-piston and the adjacent or outer end of said valve-chan'iber. The U communicates by a small passage 'u W the exhaust-passage R2.

The auxiliary valve consists or' a cylindric valtre-bushing V, Figs. 2, 4, and 1S, inserted in the inner end of' the cylinder, closed at its outer end by a plug' tV3 and openingl at its in-n ner end into the cylinder. ln said valve-casind is an endwise-sliding valve-plug V', having at its outer end ar enlarged part or head, which lits and slides in the correspondinglyenlarged outer part of the valve-bushing V. A passage o leads from trie smaller inner part ot valve-buslring;h to the interior of the bushing K of the'throttle-valve. A second passage o leads from the outer or larger end oi'A the bushing V toa longitudinal passage l, which opens into the cylinder through a port n2, located at such distance from the outer end of the cylinder that it will be uncovered by the plunger when the latter approaches the outer limit ol its movement, as seen in Fig. 2. A third passage 'U3 leads from the bushing V at a point adjacent to the shoulder between the larger and smaller parts of the bushing V outwardly through the wall ol the cylinder to the outer air. The smaller inner end cl the valveplug` Y is exposed to the pressure of air in the inner end or the cylinder, While the larger outer end or said plug is subject to live-air pressure from the interior of the cylinder entering the passage V2 when the plunger reaches the outer limit ol' its stroke. The inner or smaller end ol the plug V acts with the partof the bushing which surrounds it to form a valve for controlling the passage of air through the passage n from the air-supply pipe to the inner end of the cylinder, the said plug closing the passage when at the inner limitJ of .its movement. `When the plug V is at the outward limit of its movement, air is free to pass from the supply-pipe through the passage i) to the inner end of the cylinder. The passage n serves merely as a leakage-port to permit escape of air from the interior of the cylinder on its larger' outer end.

As soon as the port t is uncovered by the plunger B in its outward movement pressure jlluid fro] the interior of the cylinder will pass through the passage T and acting on the inner larger end of the piston will force the same outwardly, it being understood that the smaller outer end ol' the valve-piston will he subject to the same pressure, but by reason of said smaller area of the outerend of tne valve-piston pressure on the larger end thereoll will overcome such pressure on the smaller end. lt follows that the plunger approaches the outer limit of its movement the valve-piston will'be shifted to bring the same into position for the admission of f at the inner end of the cylinder.

exhaustort for the reason thatuntil t U 1s coveredby theplu "l'ree to pass nomthemte lorol sienes Vphurejer approaches the inward limit of its stroke it willlcover or close theeXhaust-port R and also the passage Uand will thereafter act to compress the air coini'ned within the inner end of the `ylinder7 which at this will have no outlet through the controllingvalve, because the port o will at this time oe closed by the valve-piston. The airconlined Within the cylinder will act on the smaller inner end el the plug V ot'the auxiliary .val-ve and torce the same outwardly.

The passage U heingconnected vwith the exhaust-port R by the small passage u, ne

-air will be forced through ther-said passage U `into the controlling-valve chamberetter the plunger in its inward movement se' une cylinder through the passage l), the passa/gen, and the exhaust-passage RZ to thel enteran".

IThe plunger is started in its outward erfreturn movement hy the act-ion or the-air compressed Within the inner end4 of ,the cylinder, and as soon as the passage Udisuncovered by the plunger in such outward .movement thereof air under pressure fromlthe supplypipe, `admitted to the inner end of the cylinder throughthe passage vi1 of theauxiliarv valve, passes Aromsaid inner end ot the cylder through the passage U to the outer or smaller end of the controlling-valve chamber and acting on the smaller end ol' the yvalvepiston F forces the latter inwardly, bringing it into positionfor admission. of air tothe inner end ol the cylinder through the inlet-port P and for the exhaust ol" air from the outer end of the cylinder through the passages Q, Q2, and Q, the port q, andthe main exhaustport S. Some of the air entering the passage U will escape through the small passage-u to the main exhaust port; but the quantity which will thus escape will be so smallsas to be of noronsequence so far as the operation of the air-pressure to move the controllingvalve piston is Concerned.

The air which is between the inner end ol" the piston and the plate G at 'this time is allowed toiescape through the passage T and port t/ to the interior of the cylinder at the outer end thereof, which may be provided with the usual auxiliary exhaust-ports "W lll and wherein the pressure will be less than that rlhe auxiliary-valve plug);` V will remain in position for admission of air through said auxiliary valve to the cylinder until the plunger approaches the outer limitl of itsstrolre and uncovers the port if?, when air from the .inner end of the cylinder will pass through the passage V2. and

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emacs ting live-air pressure to the larger face of said piston.

4. The combination with a cylinder and a plunger therein, of a live-air-actuated controlling-valve embracing a valve-piston which is ci larger area at one end than the other, means controlled by the plunger -for admitting live air to act on the larger end ol said valve-piston, and an auxiliary valve for controlling the admission of live air to act on the smaller end of said valve-piston, said auxiliary valve embracing a valve-piston having two faces ol dill'crent areas, its smaller face being subject to the pressure ot air compressed within the inner end ol' the cylinder 1 n the back stroke ol" the plunger, and its larger face being subject to live-air. pressure controlled by the movement of the plunger in the cylinder.

5. The combination with a cylinder and plunger therein, of a live-air-actuatcd coutrolling-valve, and an auxiliary v: ive for controlling the admission to the controllingvalve .of live air to actuate the latter, said auxiliary valve. having a shifting plug. provided with two faces oll different areas, its face oi" smaller' arca being subject to pressure of air compressed within the innerend ci' the cylinder in the backward stroke or the plunger, and its face of larger area being subject t0 direct air-pressure from an airpassage kcommunicating with the outer end of the cylinder through a port which is uncovered by the lunger in its outward movement.

6. T e combination with a cylinder and plunger therein, of a controlling-valve actuated by live air delivered thereto from the cylinder, and an auxiliary valve for controlling the supply of live air to the cylinder for operating lary valve being actuated by the air com ressed 1n the inner end o ressure of the c lmder by t e plunger in the backward stro ie of the latter.

7. The combination with a cylinder and a plunger therein, of a controlling-valve controlling the admission and exhaust of air into and from the opposite ends of the cylinder, said valve embracing a valve-piston having at its ends faces of different areas, and which slides in 'a-valve-ehamber; the larger end of said valve-chamber being connected with the interior of the cylinder by a passage opening into the cylinder through a ort near the outer end ofsaid cylinder am which is uncovered by the plunger Vin its outward movement, and the smaller end of said chamber being connected with the interior of the lcylinder by a passage opening into the cylinder near the inner end of the latter, an air-sup ily passage through which live air is delivered to the inner end of the cylinder to act on the smaller end of the controlling-valve piston, and an auxiliary valve for controlling the inlflow of air to the cylinder through said supplypassage,

the controlling-valve, said auxilvalve chamber provided embracing a valve-chamber larger at one end than the other and a valve-piston in the said chamber, having opposite faces of dill'erent arcas, the smaller end of said auxiliary-valve chamber being in direct communication with the interior of the c linder at the inner end ol' the latter, and the larger cnd of' the said chamber communicating with a passage opening into the interior of the cylmder near its outer end through a port which is uncovered by the plunger when near the outer limit of its stroke.

8. The combination with a cylinder and a plunger therein, of a valve controlling the admission and exhaust of air into and from the opposite ends oi' the cylinder, said controlling-valve embracing a valve-chamber larger at one cndthan at the other, and a valvepiston in said chamber having opposite faces oi dill'erenl, areas, said cylinder being provided with a passage connected with the larger part oi' tht` controlling-valve chamber and opening into the outer end of the cylin-l der by a port which is uncovered by the plunger in its outward movement, an auxiliary valve embracing a valvechamber having larger and smaller parts, and provided in its smaller part with a port communicating with the air-su ply passage, and a valve-piston in said auxi lary-valve chamber provided with faces oi diil'ercnt areas, the' cylmder having a passage connecting the larger part of the aux- .liary-valve chamber with the outer end of the cylinder and opening into the latter by a port which is uncovered by the plunver in its outward movement; the smaller en( of said auxiliary-valve chamber opening into the inner endoithe cylinder, whereby the smaller face of the said auxiliary-valve piston issubject to the pressure of air compressed within said inner end of the cylinder in the backward stroke of the plunger. i

9. -The combination with a cylinder and a plunger therein, of a valve controlling the admission and exhaust of air into and trom the opposite ends of the cylinder, said valve embracing a valve-casing having larve and smallpart's, and a valve-piston in said charnber having opposite faces of different arcas, said cylinder. being provided with a passage connectin the larger part of the valve-chamber with tie interior of the cylinder near its outer endgand which opens 'into the cylinder througha port which is'uncovered by the plunger in its outward movement, said cylinder being' also provided with a passage con-` necting the'smaller end ,of said controllingvalve chamber with the interior ol' the cylinder near the inner end of the latter, an auxiliary valve embracing a valve-casing having a port communicating with the air-supply passage, and a valve-piston in said auxiliarywith opposite faces of dill'erent'areas, a passage connecting the larger part of the auxiliary-valve chamber IOO with the outer end of the. cylinder' end which opens into the latter through e port which is uncovered by the plunger in its outward movement, the smaller end of the controlling- 'valve chamber being in open communican tion with the seid cylinder at the inner end of the latter, seid auxiliary Valve operating to open and close communication between the sii-supply passage and the inner end of the eylinc er, and the auxiliary-valve piston being operated to open the auxilio-ry valve by air compressed in the inner end of the cylinder acting on the smaller end of said piston, whereby the* smaller end of the controllingyalve piston is subject to the pressure of air entering the cylinder from the auxiliary valve and passing irorn the cylinder to the smaller part ol seid controlling-Valve chem- ,J

LIL

i The combination with u cylinder and a nger tberein/` of o oontrollingwztlve comn Y( valve-chamber which is closed at 'li ends and is provided et its ends with rlindrio parts of different diameters, said l i ,niber being provided with ii'v'e latlongitudinallyseperated ports, to Wit7 mi niissioiuport for the inner end of the cyl-- `r, e nniin sir-supply port, e supply end isi, port Afor the outer end of the cylinexbaust-port, and en exhaust ie inner end of the Cylinder, said ,uppir port being located between sion-port for the inner end of the erind the admission and exhaust port outer end ot the cylindery and the berust-oor l glooatedbetwoen the e eruuuist port for the outer Cylinder and the exileusteport for of the cylinderI and said eX- hsustort for the inner end of the Cylinder beine lloc-ated in the cylindric smaller part of enomber, e yalvepiston-having et end o larger oylindrio flange that its and slides in tile lower end of the Valve-chavm 'lapted to ope-n and close comeen the Admission ort for the cylinder and t e moin s opposite end with s bien. is adopted. to iit and end of the cylinder communication bet-port'or the inner end of the .arid the mein enhmist-portj and seid -piston being 3 )ro'vicled with en intermediate i" fe eden-fed to be shifted to one, sido or tie rctl oi the admission and eX- iqort tor t outer end of the cylinder to the seine into oonnnunicetion with n 'n admission-port or the mein ziiistort, and moons ior supplying sir i l L under pressure to the opposite ends of thel valve-chamber Jfor otueting said vorlveepiston.

il. The eombinstion with seylinder sind o plunger therein,of a Controlling-valve cornprising e Valye-ehamber which is closed at both ends end is provided et its ends with eylindric parts of di'erentV diameters, seid valve-chamber being provided with five leteral, longitudinally-seperated ports, to Wit, an admission-port for the inner end of the cylinder, a mein air-supply port, e, suppl and exhaust port for the outer end of the ey e end o larger oylindric Bange that lits and slides in the lower end of the Valve-chamber and is adapted to open and close communicetion between the sdmissiomport for the inner end oi the cylinder and the main su ply-port, sind et its opposite end with a sms ler flange which is adapted to rit and slide Within 'the smaller end or' the o 'linder and to open and elose communication between the exhaustport torA the inner end of the cylinder and the main exheust-port, and seid Valve-piston being provided with en intermediate flange adapted to be shifted to one side or the other of the admission' and exhaust port for the outer end of the cylinder t'o bring the same into communication With either the mein admission-port or the main exhaust-port, said cylinder being provided With a passage leading from the larger endV of the valyefohember toward the outer end of the cylinder sind opening into the latter through e port which is uncovered by the plunger when the latter approaches the outward 'limit of its stroke, endwith e message oouneoted with the smaller end of seid valve -ohember through which' air under pressure is admitted to the latter.

in testimony that l claim the foregoing es my invention l affix my signature, in pres ence of two witnesses, this 25th dey of May,

A., D i995.

` REXNHOLD A. NORLING. Witnesses WM. H. Esseri, Hees/7er iomurs.

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